Java NIO中Pipe類源碼__nio

Java NIO中Pipe類源碼

/** * A pair of channels that implements a unidirectional pipe. * * <p> A pipe consists of a pair of channels: A writable {@link * Pipe.SinkChannel </code>sink<code>} channel and a readable {@link * Pipe.SourceChannel </code>source<code>} channel.  Once some bytes are * written to the sink channel they can be read from source channel in exactly * the order in which they were written. * * <p> Whether or not a thread writing bytes to a pipe will block until another * thread reads those bytes, or some previously-written bytes, from the pipe is * system-dependent and therefore unspecified.  Many pipe implementations will * buffer up to a certain number of bytes between the sink and source channels, * but such buffering should not be assumed.  </p> */public abstract class Pipe {       public static abstract class SourceChannelextends AbstractSelectableChannelimplements ReadableByteChannel, ScatteringByteChannel    {protected SourceChannel(SelectorProvider provider) {    super(provider);}public final int validOps() {    return SelectionKey.OP_READ;}    }    public static abstract class SinkChannelextends AbstractSelectableChannelimplements WritableByteChannel, GatheringByteChannel    {protected SinkChannel(SelectorProvider provider) {    super(provider);}public final int validOps() {    return SelectionKey.OP_WRITE;}    }    protected Pipe() { }    public abstract SourceChannel source();    public abstract SinkChannel sink();    public static Pipe open() throws IOException {return SelectorProvider.provider().openPipe();    }}